基于马赫-曾德干涉的保偏光纤扭曲传感器研究  

Polarization-dependent twist sensor based on fiber Mach-Zehnder interferometer

作　　者：路艳芳 楼伟民[1] 申屠锋营 王友清[1] 沈常宇[1] 

机构地区：[1]中国计量大学光电子技术研究所,浙江杭州310018

出　　处：《光电子．激光》2018年第1期34-38,共5页Journal of Optoelectronics·Laser

基　　金：浙江省自然科学基金(LY16A040005);国家质检公益科研专项(201510066)资助项目

摘　　要：实现了一种基于马赫曾德干涉原理的扭曲传感器,其主要通过将一段15mm长的保偏光纤(PMF)两端分别与单模光纤(SMF)错位熔接构成。PMF的扭曲会导致沿两个正交偏振态传输的光强发生变化,从而导致干涉光谱中共振峰的强度发生变化。通过测量慢轴共振峰在顺时针和逆时针两个方向扭曲0~180°的强度变化,得到传感器的最高灵敏度为0.624dB/°·m-1,是已有类似扭曲传感器灵敏度的两倍。本文扭曲传感器结构简单,得益于实验中采用的强度解调方法,相比于相位调制型光纤传感器,价格更低廉,在实际应用中具有更好的前景。A polarization-dependent twist sensor based on an in-fiber Mach-Zehnder interferometer is pro- posed. The sensor is constructed by core-offset fusion splicing of a 15-mm-long polarization maintaining fiber （PMF） between two single mode fibers. With the increasing of the twist applied on the sensor,the intensity of the output light transmitting along the two orthogonal polarization states has changed,which leads to the intensity changes of the resonance peaks in the transmission spectrum. By measuring the slow axis resonance peak intensity changes in clockwise and counterclockwise directions with the distort- ed angle within 0-180°,the maximum sensitivity can reach 0.624dB/°·m^-1,which is almost 2 times of that of the existing similar strain sensor. Due to the intensity demodulation method, the proposed sen- sor has an application advantage in marked contrast compared with other twist optic fiber sensors which usually employ high-cost wavelength-shift means.

关 键 词：光纤传感器 扭曲 马赫一曾德干涉 保偏光纤(PMF) 

分 类 号：TN253[电子电信—物理电子学]